| 摘要: |
| 以某高速公路的煤矸石路基材料为主要研究对象,在实验的基础上,利用数值模拟的方法,对煤矸石区域地下水系统中的硝酸盐浓度进行了数值模拟,分析了分布规律.研究结果表明:随着时间的推移,受污染面积在横向和纵向不断扩大,且横向更为显著,同时受污染范围较大的主要是地下水的下流方向;另外,硝酸盐浓度沿两轴方向呈递减趋势,淋溶液对地下水系统的污染程度随距污染源的距离的增大而降低.目前该研究路段的地下水硝酸盐浓度(以N计)达到地下水环境质量标准(GB/T14848-93)Ⅰ类标准,通过数值模拟可得,该高速公路建成10年后,研究路段的地下水硝酸盐浓度(以N计)达到地下水环境质量标准(GB/T14848-93)Ⅲ类标准. |
| 关键词: 煤矸石 地下水 硝酸盐 数值模拟 |
| DOI： |
| 分类号: |
| 基金项目:交通运输部科技项目(2010-353-343-290);湖南省交通科技项目(201155) |
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| The numerical simulation for coal gangue as roadbed material on groundwater nitrate concentration |
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DU Yongli1, HUANG Xiangjing2, QI Fangfang3, HUANG Manhong3
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1.School of Civil Engineering,Central South University;2.Hunan Provincial Communications Planning,Survey & Design Institute;3.College of Environmental Science and Engineering,Donghua University
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| Abstract: |
| Numerical simulation was used to elaborate temporal and spatial distribution of nitrate concentration in groundwater under one highway,which was constructed with coal gangue based on experiment.Experimental results indicated that the contaminated area spread around over time,but more obviously in horizontal direction,especially in groundwater flow direction.In addition,nitrate concentration decreased gradually in two-axis direction,and contaminated degree decreased with the increasing of distance from the contaminated source caused leaching solution.Numerical simulation suggests that the nitrate concentration (N) in the section will only meet the standard of class III (GB/T14848-93) for groundwater environmental quality after 10 years,although the concentration reaches the standard of class I currently. |
| Key words: coal gangue groundwater nitrate numerical simulation |
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